Volcanic ash and dust can have the effect of ___
a) reducing the sunlight that reaches Earth's surface, suppressing photosynthetic processes
b) reducing Earth's surface temperature
c) damaging aircraft that fly through the dust
d) causing unusual weather
e) All of the previous answers are correct.
Answer: e) All of the previous answers are correct.
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Which of the following diseases is associated with the overproduction of cAMP?
A) Alzheimer's B) cholera C) Parkinson's D) none of these
Which of these is NOT one of the four Earth systems?
A) ozonosphere B) lithosphere C) atmosphere D) biosphere E) hydrosphere
Simple pumping gets only about 30% of the oil in a reservoir rock out of the ground. To increase the pumping/recovery rate, what kind of secondary recovery technique can be used?
a. Force the steam into the ground nearby (the steam heats the oil in the ground, making it less viscous) b. Use new drill bits c. Hydrofracturing (or fracking) d. Use a more powerful pump e. Both a and c
Hillslopes typically are static systems
Indicate whether the statement is true or false